What does it mean when you can't send emails due to server not allowing relaying

Try reading the threads listed over on the right under the heading More Like This

Allan

Dunfermline wrote:

Can't send emails re server not allowing relaying - why?

It means that you did not set up the outgoing (SMTP) mail server for your email account correctly. Most likely you did not enter your email address and password because it said "optional". It isn't optional.